1181271 has 16 divisors (see below), whose sum is σ = 1938944. Its totient is φ = 622944.

The previous prime is 1181269. The next prime is 1181281. The reversal of 1181271 is 1721811.

It is not a de Polignac number, because 1181271 - 2¹ = 1181269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1891 + ... + 2436.

It is an arithmetic number, because the mean of its divisors is an integer number (121184).

2^1181271 is an apocalyptic number.

1181271 is a deficient number, since it is larger than the sum of its proper divisors (757673).

1181271 is a wasteful number, since it uses less digits than its factorization.

1181271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350.

The product of its digits is 112, while the sum is 21.

The square root of 1181271 is about 1086.8629168391. The cubic root of 1181271 is about 105.7101074038.

The spelling of 1181271 in words is "one million, one hundred eighty-one thousand, two hundred seventy-one".